KTM 640 LC4 Enduro (1999-00)

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The KTM 640 LC4 Enduro is a motorcycle model from 1999-2000 with a four-stroke, single-cylinder engine featuring SOHC and four valves with an engine balancer. The capacity is 624.6 cc with a compression ratio of 11.5:1. The cooling system is liquid-cooled, and lubrication is provided by two Eaten oil pumps. The induction is a Mikuni BST 40 carburetor and the ignition is Kokusan contactless DC-CDI with an advanced system. The motorcycle has both an electric and kick start, with a 12V 8Ah maintenance-free battery. The maximum power output is 40.1 kW/55 hp at 7000 rpm and the maximum torque is 55 Nm/5.6 kgf-m/40.6 lb-ft at 5500 rpm. The clutch is a multi-disc in oil bath and the transmission is a five-speed with a final chain drive. The frame is central chrome-moly steel, and the suspension includes a White Power Up Side Down 4357 MXMA fork on the front and a central shock absorber with PRO-LEVER linkage to rear-swing-arm and needle bearing on the rear. The bike also features front and rear disc brakes, and the front tire is 90/90-21 while the rear is 140/80-18. The steering head angle is 62 degrees, and the wheelbase is 1510 mm/59.4 in. The ground clearance is 310 mm/12.2 in, the seat height is 930 mm/36.6 in, and the wet weight is 158 kg/348 lbs. The fuel capacity is 12 L/3.2 US gal/2.6 Imp gal and the average consumption is 4.7 sec. The top speed for the KTM 640 LC4 Enduro is 168 km/h (104 mph).

Technical specifications:

Make Model: KTM 640 LC4 Enduro

Year: 1999 – 00


Engine: Four stroke, single Cylinder. SOHC, 4 valves, engine balancer
Capacity: 624.6 cc / 38.1 cu in
Bore x Stroke: 101 x 78 mm
Compression Ratio: 11.5:1
Cooling System: Liquid cooled
Lubrication: 2 x Eaten oil pumps
Induction: Mikuni BST 40 carburetor
Ignition: Kokusan contactless DC-CDI ignition with advanced system
Starting: Electric & kick
Spark Plug: NGK DRBEACPR 8 E
Battery: 12V 8Ah, maintenance free
Max Power: 40.1 kW / 55 hp @ 7000 rpm
Max Torque: 55 Nm / 5.6 kgf-m / 40.6 lb-ft @ 5500 rpm
Clutch: Multi-disc in oil bath
Transmission: 5 Speed

Primary Drive Ratio: 30:81, straight cut gears
Gear Ratios: 1st 14:35 / 2nd 15:24 / 3rd 18:21 / 4th 20:19 / 5th 22:18
Final Drive Ratio: 17:38
Final Drive: Chain, O-ring 5/8 x 1/4″
Frame: Central chrome-moly steel frame
Front Suspension: White Power Up Side Down 4357 MXMA fork
Front Wheel Travel: 280 mm / 11.0 in
Rear Suspension: Central shock absorber (WP BAVP3612) with PRO-LEVER linkage to rear- swing-arm with needle bearing
Rear Wheel Travel: 320 mm / 12.6 in
Front Brakes: Single 300 mm disc, 4 piston caliper
Rear Brakes: Single 220 mm disc, 1 piston caliper
Front Tyre: 90/90 – 21
Rear Tyre: 140/80 – 18
Steering Head Angle: 62o
Wheelbase: 1510 mm / 59.4 in
Ground Clearance: 310mm / 12.2 in
Seat Height: 930 mm / 36.6 in
Wet Weight: 158 kg / 348 lbs
GVWR: 350 / 773 lbs
Engine Oil Capacity: 2.1 L / 2.2 US qt / 1.8 Imp qt

Fuel Capacity: 12 L / 3.2 US gal / 2.6 Imp gal
Consumption Average: 4.7 sec
Top Speed: 168 km/h / 104 mph

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